Large eddy simulations of a circular orifice jet with and without a cross-sectional exit plate

doi:10.1088/1674-1056/23/4/044704

Abstract The effect of a cross-sectional exit plane on the downstream mixing characteristics of a circular turbulent jet is investigated using large eddy simulation (LES). The turbulent jet is issued from an orifice-type nozzle at an exit Reynolds number of 5× 10⁴. Both instantaneous and statistical velocity fields of the jet are provided. Results show that the rates of the mean velocity decay and jet spread are both higher in the case with the exit plate than without it. The existence of the plate is found to increase the downstream entrainment rate by about 10% on average over the axial range of 8-30d_e (exit diameter). Also, the presence of the plate enables the formation of vortex rings to occur further downstream by 0.5-1.0d_e. A physical insight into the near-field jet is provided to explain the importance of the boundary conditions in the evolution of a turbulent jet. In addition, a method of using the decay of the centreline velocity and the half-width of the jet to calculate the entrainment rate is proposed.

Keywords: circular orifice jet large eddy simulation (LES) exit plate entrainment

Received: 07 June 2013
Revised: 27 September 2013
Accepted manuscript online:

PACS:	47.27.ep	(Large-eddy simulations)
	47.27.wg	(Turbulent jets)
	47.85.lk	(Mixing enhancement)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11072005 and 10921202) and the Fundamental Research Funds for the Central Universities, China (Grant No. 3132013029).

Corresponding Authors: Mi Jian-Chun
E-mail: jcmi@coe.pku.edu.cn

About author: 47.27.ep; 47.27.wg; 47.85.lk

Cite this article:

Zhang Jian-Peng (张健鹏), Xu Min-Yi (徐敏义), Mi Jian-Chun (米建春) Large eddy simulations of a circular orifice jet with and without a cross-sectional exit plate 2014 Chin. Phys. B 23 044704

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Large eddy simulations of a circular orifice jet with and without a cross-sectional exit plate

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